Getting poor write speed on SSD on cMP1,1

Discussion in 'Mac Pro' started by Zeke D, Feb 24, 2016.

  1. Zeke D macrumors 6502a

    Zeke D

    Joined:
    Nov 18, 2011
    Location:
    Arizona
    #1
    I'm under no illusions that I'll get the full 300MB/s that SATAII is rated at, but 150MB/s write speed seems too low. Am I managing my expectations appropriately, or is 150MB/s standard fare for the 1,1 with the SSD installed in a drive bay with the NewerTech Adaptadrive?

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  2. flowrider macrumors 601

    flowrider

    Joined:
    Nov 23, 2012
    #2
    I'm getting here speeds with a Samsung EVO in my 5.1 cMP in a drive Bay.

    840 EVO on SATA Bus.jpg
    Lou
     
  3. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #3
    Assuming the SSD has at least 20% empty space. I will do 2 things.

    1) Check the spec of the SSD, find out the expected write speed

    2) Check if TRIM is enabled, if not, enable it
     
  4. Fancuku macrumors 6502a

    Fancuku

    Joined:
    Oct 8, 2015
    Location:
    PA, USA
    #4
    Some of the cheaper 128gb SSDs only get about 180 mbps write speeds so I am not that surprised.
     
  5. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #5
    Just have a quick check of the V300 (120G) on Google. OP's write speed is normal for Incompressible data. It's the expected behaviour of the SandForce controller.
     
  6. Squuiid macrumors 6502a

    Joined:
    Oct 31, 2006
    #6
    Avoid Sandforce SSDs folks. They're awful.
     
  7. Zeke D thread starter macrumors 6502a

    Zeke D

    Joined:
    Nov 18, 2011
    Location:
    Arizona
    #7
    Thanks, all y'all. I contacted Kingston, and they're going to replace the drive. They market this drive as a 450MB/s drive, so there's no way they should be able to give me a drive doing 150MB/s and claim 450MB/s. I'll let you all know how I fare with the new drive.
     
  8. Squuiid macrumors 6502a

    Joined:
    Oct 31, 2006
    #8
    Unfortunately, I think you'll find there is nothing wrong with that drive. The replacement will behave the same, mark my words.
     

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